Please give me an explanation on how to do these, I have more than just this one

a) The exponential decay function that models the situation whereby the value of houses in a city is decreasing at a rate of 3% per year is  f(x) = 450,000 x 0.97^x.

b) The value of this house that currently costs $450,000, based on the above exponential decay function, 4 years from now is $398,381.76.

c) It will take 13.3 years till the value of the house is $300,000.

An exponential decay function describes an exponential function whereby the value of an asset reduces consistently at a constant percentage rate over a period.

The formula for an exponential decay is given as y=a(1-b)^x.

In this exponential decay formula, y is the final amount, a is the original amount, b is the decay factor, and x is the amount of time that has elapsed.

Finally, we can use an online finance calculator to determine the number of years till the value of the house reduces to $300,000.

The current cost of a house in the city = $450,000

The decreasing rate per year = 3%

Continuous annual decreasing factor = 0.97 (100% - 3%)

Let the value of the house in x years = f(x)

a) f(x) = 450,000 x 0.97^x

b) Value of the house 4 years from now = 450,000 x 0.97^4

= $398,381.76

c) The number of years till the value is $300,000:

300,000 = 450,000 x 0.97^x

I/Y (Interest per year) = -3%

PV (Present Value) = $450,000

PMT (Periodic Payment) = $-0

FV (Future Value) = $-300000

Results:

Number of period (#) = 13.312

Thus, the total Decay after 13.312 years is $150,000.00 ($450,000 - $300,000).

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The area of the shaded portion in the image of right triangle attached is solved to be 401.85 square millimeters

The area of the shaded portion is solved by subtracting the area of the smaller triangle from the area of the bigger triangle

The area of a triangle is solved using the formula

= 0.5 base * height

Information given in the problem  

base1 = 24.8

base2 = 15.9

height1 =  34.2 mm

height2 = 21.9

where

base1 and height1 are for the bigger triangle while

base2 and height2 is for smaller triangle

area of shaded portion = 0.5(24.8 * 34.2) - 0.5(15.9 * 21.9)

area of shaded portion = 418.95 - 174.105

area of shaded portion =401.845

area of shaded portion = 401.85 square millimeters

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The length of the diagonal of the television screen is equal to 56 cm to the nearest centimeter using the Pythagoras rule.

The Pythagoras rule states that in a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. 

we shall represent the length of the diagonal with the letter x so by Pythagoras rule we can write:

x² = 34² + 45²

x² = 1156 + 2025

x² = 3181

x = √3181 {take square root of both sides}

x = 56.4004

Therefore, the length of the diagonal of the television screen is equal to 56 cm to the nearest centimeter using the Pythagoras rule.

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Step-by-step explanation:

that makes NOP and QRP similar triangles.

that means that there is one common scale factor for the lengths of all pairs of correlating sides.

that means

QR/NO = RP/OP

OP = OR + RP

20/32 = RP/(12 + RP)

20(12 + RP) = 32RP

240 + 20RP = 32RP

240 = 12RP

RP = 20

Answer:

Fifty eight and twenty-three hundredths

Step-by-step explanation:

The values of x that would give a profit of $300 is 20 and 60.

Revenue is the total amount of money that can be made from selling x items while cost is the amount of money used to produce x items.

Profit is the difference between revenue and cost. Profit is given by

Profit = Revenue - Cost

Since Cost C = 60x + 300, Revenue R = 100x − 0.5x², hence:

Profit = Revenue - Cost

Profit = 100x − 0.5x² - (60x + 300)

Profit = 40x - 0.5x² - 300

For a profit of $300:

300 = 40x - 0.5x² - 300

0.5x² - 40x + 600 = 0

x = 20 and x = 60

Hence the values of x that would give a profit of $300 is 20 and 60.

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The required prove to show that ΔABC is similar to ΔMNC is explained below.

A given set of triangles are said to be similar if on comparing their corresponding properties, there exist some common relations among them. The similarity of two or more triangles do not imply that they are congruent.

Considering the given diagram, we have;

AM = MC    (Given)

BN = NC     (Given)

BC = BN + NC (addition property of a line segment)

AC = AM + MC (addition property of a line segment)

NC/ BC = MC/ AC = constant

<ACB = <MCN  (Reflexive property)

Therefore,

ΔABC ~ ΔMNC (Side-Angle-Side theorem)

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The polynomial which is as described in the task content is; P (x) = -0.2 (x - 1)² (x +4).

It follows from the task content that; P(x) has a root of multiplicity 2 at x = 1 and a root with multiplicity of 1 at (x - 4).

Therefore, the polynomial would take the form;

P(x) = a (x - 1)² (x + 4)

Therefore, since the y-intercept is; y = -0.8

Therefore, we have that!

-0.8 = a (0-1)² (0+4)

-0.8 = 4a

a = -0.8 / 4

a = -0.2

Ultimately, the formula for the polynomial P(x) as given in the task content is; P (x) = -0.2 (x - 1)² (x +4).

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Enquire οf each pupil in yοur math class. --> b. Cοnvenience

chοοsing every 5th persοn οn a list  --> d. Systematic

pulling 50 names frοm a hat --> a. Simple Randοm

Chοοse twο cafeteria tables at randοm, then pοll every patrοn at thοse twο tables. --> e. Stratified

selecting 30 individuals frοm each gender after dividing the pοpulatiοn intο genders. --> c. Cluster

Samples can be categοrized intο:

Cοnvenient: Sample taken frοm a pοοl that is easily accessible.

Put all the pοssibilities intο a hat, and draw sοme οf them at randοm.

Every kth cοmpοnent is taken in a systematic manner. If yοu wanted tο survey anything οn the street, fοr instance, yοu may interview every fifth persοn.

Cluster: This pοpulatiοn is brοken dοwn intο grοups, οr clusters, and each cluster's cοnstituents are surveyed.

Further divides the peοple intο several grοups. After that, thοugh, just a small percentage οf the grοup gets quizzed.

Thus, cοrrect match οf the sampling methοd are:

enquire οf each pupil in yοur math class. --> b. Cοnvenience

chοοsing every 5th persοn οn a list  --> d. Systematic

pulling 50 names frοm a hat --> a. Simple Randοm

Chοοse twο cafeteria tables at randοm, then pοll every patrοn at thοse twο tables. --> e. Stratified

selecting 30 individuals frοm each gender after dividing the pοpulatiοn intο genders. --> c. Cluster

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1. B.

2. C.

3. A.

4. C.

Consequently, 308 °is the main arc's length and minor arc is 52°

An angle whose apex is a circle's center is said to have a center angle.

The minor arc connects two locations on a circle in the shortest distance possible. The main arc connecting them is the longest arc.

. For instance, two locations A and B on a circle are connected by two arcs:

the major arc, which travels clockwise around the circle, and the minor arc, which travels anticlockwise (the minor arc) .

The minor arc's length is equivalent to the center angle's length in degrees.

Consequently, the minor arc is 52 degrees in length.

The major arc's measure is equivalent to 360 ° minus the minor arc's measurement.

The main arc's length is therefore 360 – 52 = 308 °.

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By induction, we can conclude that in a semigroup, all products of x1, x2, ...... xn (in that order) are equal.

A semigroup is a mathematical structure consisting of a set of elements along with an associative binary operation. The operation must be associative, meaning that the result of the operation is independent of the order of the operands.

We can prove this by induction. Let S be a semigroup and x1, x2, x3, ..., xn be the elements of S.
Base Case: When n = 2, then the product of x1 and x2 is x1x2.
Inductive Step: Assume that the product of x1, x2, ..., xn (in that order) is equal. Then we can prove that the product of x1, x2, ..., xn+1 (in that order) is also equal.
Let a be the product of x1, x2, ..., xn (in that order). Then a = x1x2x3....xn.
Now the product of x1, x2, ..., xn+1 (in that order) is a x xn+1. Since S is a semigroup, a x xn+1 = x1x2x3....xn x xn+1.
Since the product of x1, x2, ..., xn (in that order) is equal, a = x1x2x3....xn. Therefore, the product of x1, x2, ..., xn+1 (in that order) is also equal.
By induction, we can conclude that in a semigroup, all products of x1, x2, ...... xn (in that order) are equal.

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Answer:

x = -3 ; y = 5

Step-by-step explanation:

Hey there!

This question has given us information about both of the given variables, x, and y

It tells us the y is equal to x plus 8 and that x plus y is equal to 2

If y is equal to x plus 8, we can

substitute the y value into the second equation

This will give us the following equation:

x + (x + 8) = 2

Now we simplify to solve for x

2x + 8 = 2

2x = -6

x = -3

Now that we know the x value, we can substitute that value into any one of the two equations given to solve for y

I'm going to use the first equation

Since we know that x is -3, we can now input it into the first equation and then simplify;
y = -3 + 8

y = 5

Answer:

Step-by-step explanation:

[tex]\tt y=x+8\\x+y=2[/tex]

Substitute y= x+8, into x + y=2:-

[tex]\tt x+y=2[/tex]

Let y = x+8

[tex]\tt x+x+8=2[/tex]

[tex]\tt 2x+8=2[/tex]

Solve for x :-

[tex]\tt 2x+8=2[/tex]

Subtract both sides by 8:-

[tex]\tt 2x+8-8=2-8[/tex]

[tex]\tt 2x=-6[/tex]

Divide both sides by 2:-

[tex]\tt \cfrac{2x}{2} =\cfrac{-6}{2}[/tex]

[tex]\boxed{\bf x=-3}[/tex]

Now, to solve for y, Substitute x = -3 into y=x+8:-

[tex]\tt y=x+8[/tex]

Let x = -3

[tex]\tt y=-3+8[/tex]

Simplify:-

*-3 + 8 = 5*

[tex]\boxed{ \bf y=5}[/tex]

Therefore, the solutions to the given system are x= -3 & y =5.

______________________

Hope this helps!

The probability that a biscuit is made by machine J and is not broken is given as follows:

0.245 = 24.5%.

A probability is calculated as the division of the desired number of outcomes by the total number of outcomes in the context of a problem/experiment.

In this problem, we are given a probability tree, hence to obtain the desired probability we must just choose the correct node.

The desired node is given as follows:

Hence the probability that a biscuit is made by machine J and is not broken is given as follows:

0.25 x 0.98 = 0.245.

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Answer:

a)3,6,9,12,15

b)9,18,27,36,45

c)14,28,42,56,70

Step-by-step explanation:

multiply each of it with 1,2,3,4 and 5 :)

Answer:

3-3,6,9,12,15

9-9,18,27,36.45

14-14,28,42,56.70

According to the given information, your share of the groceries was $39.95, your other roommate's share was $42.05, and Sarah's share was $0.

What is equation?

An equation is a mathematical statement that shows that two expressions are equal. It consists of two sides separated by an equals sign (=). The expressions on both sides of the equation can contain numbers, variables, and mathematical operations such as addition, subtraction, multiplication, and division.

Let's call the amount of money Sarah spent on groceries "S".

Let's call the amount of money you spent on groceries "Y".

Let's call the amount of money your other roommate spent on groceries "O".

We know that:

S + Y + O = 82 (the total bill was $82)

Y = (S/2) - 0.05 (your groceries were $0.05 cheaper than half of Sarah's groceries)

O = Y + 2.10 (your other roommate's groceries were $2.10 more than your groceries)

We can use the second equation to substitute Y in the third equation:

O = Y + 2.10

O = (S/2) - 0.05 + 2.10

O = (S/2) + 2.05

We can now substitute both equations into the first equation:

S + Y + O = 82

S + ((S/2) - 0.05) + ((S/2) + 2.05) = 82

2S + 4 = 164

2S = 160

S = 80

Now that we know S, we can substitute it into the other equations to find Y and O:

Y = (S/2) - 0.05 = (80/2) - 0.05 = 39.95

O = Y + 2.10 = 39.95 + 2.10 = 42.05

So your share of the groceries was $39.95, your other roommate's share was $42.05, and Sarah's share was $80 - ($39.95 + $42.05) = $82 - $82 = $0.

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Answer:

[tex]\measuredangle \textsf{ BCA is Actue.}[/tex]

[tex]\measuredangle \textsf{ CAB is Actue.}[/tex]

[tex]\measuredangle \textsf{ ABC is Right}.[/tex]

Step-by-step explanation:

[tex]\textsf{We are asked what type of angles are provided.}[/tex]

[tex]\textsf{First, the question is asking for the \underline{measure}, which \underline{affects} the types of angles.}[/tex]

[tex]\textsf{This Triangle is a \underline{Right Triangle}, according to the \underline{Angle Markings}.}[/tex]

[tex]\textsf{One angle must be \underline{Right}, and that angle is} \ \boxed{ \measuredangle \textsf{ABC.}}[/tex]

[tex]\textsf{Becuase a Triangle adds up to \underline{180}}^{\circ}\textsf{, the other \underline{2} angles are \underline{less than 90}}^{\circ}.[/tex]

[tex]\textsf{Meaning, that} \ \boxed{\measuredangle \textsf{BCA}} \ \textsf{and} \ \boxed{\measuredangle \ \textsf{CAB}} \ \textsf{are \underline{Acute}.}[/tex]

[tex]\fbox{\textsf{Notes:}}[/tex]

[tex]\textsf{An Acute Angle is \underline{less} than 90}^{\circ}.[/tex]

[tex]\textsf{A Right Angle is \underline{equal} to 90}^{\circ}.[/tex]

[tex]\textsf{An Obtuse Angle is \underline{greater} than 90}^{\circ} \textsf{, but \underline{less} than 180}^{\circ}.[/tex]

[tex]\textsf{A Straight Angle is \underline{equal} to 180}^{\circ}.[/tex]

[tex]\textsf{A Reflex Angle is \underline{greater} to 180}^{\circ} \textsf{, but \underline{less} than 360}^{\circ}.[/tex]

Answer:

To find how much yarn Tina used for the third doll, we can subtract the total amount of yarn used for the first two dolls from the total amount of yarn used.

Total amount of yarn used = 10 1/2 yards

Amount used for first doll = 3 1/2 yards

Amount used for second doll = 4 1/8 yards

To add 3 1/2 and 4 1/8, we need to find a common denominator:

3 1/2 = 7/2

4 1/8 = 33/8

Common denominator = 8

So, 3 1/2 = 28/8 and 4 1/8 = 33/8

Total amount used for first two dolls = 28/8 + 33/8 = 61/8

Subtracting the total amount used for the first two dolls from the total amount of yarn used:

10 1/2 - 61/8 = 84/8 - 61/8 = 23/8

Therefore, Tina used 23/8 yards of yarn for the third doll.

The equation of the given line is expressed as:

y = x - 3

The formula for the equation of a line in slope intercept form is:

y = mx + c

where:

m is slope

c is y-intercept

The formula for the equation of a line between two coordinates is:

(y - y1)/(x - x1) = (y2 - y1)/(x2 - x1)

The pair of coordinate points marked are:

(4, 1) and (5, 2)

Thus, the equation of the line is:

(y - 1)/(x - 4) = (2 - 1)/(5 - 4)

y - 1 = x - 4

y = x - 3

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Answer:

720

Explanation:

[tex]2:125[/tex]

[tex]x:45000[/tex]

to go from 125 to 45000 we need to multiply by 360

that's why we will multiply 2 with 360 to balance both ratios

when we do that we get 720

2:125

[tex]\bold{720:45000}[/tex]

Answer:

720

Step-by-step explanation:

Using probability,

a. In positive mammogram, the chance of having cancer is= 7.217%

b. If patient has cancer, chance of positive mammogram is = 90%

c. A woman with negative mammogram has cancer is = 0.114%

What do you mean by probability?

The chances of an event occurring is defined by probability. There are many instances in real life where we may need to make predictions about how something will turn out. We may be sure or not sure about the results of an event.

When this happens, we say that there is a chance that the event will happen or not happen. In general, probability has many wonderful uses in games, in business to make forecasts based on likelihood, and in this emerging branch of artificial intelligence.

Now in the question,

1247 women had a positive mammogram. Out of which 90 actually had cancer. So, in positive mammogram, the chance of having cancer is:

=90/1247

= 7.217%.

100 women who received mammogram cancer or which 90 had a positive mammogram. So, if patient has cancer, chance of positive mammogram is = 90/100

= 90%.

Now 8753 women had a negative mammogram of which 10 actually had cancer. So, a woman with negative mammogram has cancer is

= 10/8753

= 0.114%

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The complete question is:

he table to the right is based on the assumption that​ 1% of breast tumors are malignant. It also assumes that mammogram screening is ​90% accurate. Complete parts​ (a) through​ (c) below

Answer: To calculate the standard deviation of a discrete random variable, we need to know the expected value and the variance. The variance of a discrete random variable X is given by:

Var(X) = Σ [ (x - E(X))^2 * P(X = x) ]

where the summation is taken over all possible values of X, and E(X) is the expected value of X.

We are given that the expected value of X is 1.95. Using the formula for the variance and the probabilities given in the table, we can calculate the variance as follows:

Var(X) = (0 - 1.95)^2 * 0.03 + (1 - 1.95)^2 * 0.31 + (2 - 1.95)^2 * 0.43 + (3 - 1.95)^2 * 0.14 + (4 - 1.95)^2 * 0.09

Var(X) = 1.1429

To find the standard deviation, we take the square root of the variance:

SD(X) = sqrt(Var(X))

SD(X) = sqrt(1.1429)

SD(X) ≈ 1.07

Therefore, the standard deviation of the number of cars owned by families in New York is approximately 1.07. None of the options given match this value exactly, but 0.99 is the closest.

Step-by-step explanation:

The equation 8(x-9)=6(2x-12)-4x (option C) has an infinite number of solutions.

Let's simplify the given equation and solve for x:

8(x-9) = 6(2x-12) - 4x

8x - 72 = 12x - 72 - 4x // Distributing 6

8x - 72 = 8x - 72 // Simplifying

We can see that both sides of the equation are equal, and there is no variable 'x' present. This means that the equation is an identity and it will hold true for any value of x.

Therefore, this equation has an infinite number of solutions, since any value of x will satisfy the equation.

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The probability that the alumni member is male and did not attend graduate school is (546-206)/1214, or 83.09%.

Probability is a measure of how likely an event is to happen. It is expressed as a number between 0 and 1, where 0 means that the event is impossible and 1 means that the event is certain. Probability is used to describe the likelihood of something happening and to make decisions when dealing with uncertain situations. Probability theory is the mathematics of predicting the outcomes of events when the exact outcome is unknown.

In conclusion, the probability that the alumni member is female is 8.55%, that the alumni member is male is 16.91%, that the alumni member is female and went on to graduate school is 8.55%, that the alumni member is male and went on to graduate school is 16.91%, that the alumni member is female and did not attend graduate school is 79.60%, and that the alumni member is male and did not attend graduate school is 83.09%.

The probability that the alumni member is female is 104/1214, or 8.55%. The probability that the alumni member is male is 206/1214, or 16.91%. The probability that the alumni member is female and went on to graduate school is 104/1214, or 8.55%. The probability that the alumni member is male and went on to graduate school is 206/1214, or 16.91%. Finally, the probability that the alumni member is female and did not attend graduate school is (668-104)/1214, or 79.60%.

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Cone B does not have volume 48bold pi cubic units with these dimensions, but it does have the same volume as Cone A because they both have volume 48bold pi cubic units.

A cone, also known as a vertex, is a three-dimensional polygonal object with a flat base and a soft tapering apex. In a plane with no vertices, a cone is formed by connecting a story arc of lines, half-lines, but rather routes those are common to all focuses on the outpost. A cone is a muti structure with just a peaceful transition from a flat, round or, base towards the vertex and apex, which represents as the base's axis. A three-dimensional polygonal shape with only an upwardly flat curved surface is known as a cone.

Because Cone A has a volume of 48bold pi cubic units, we can use the volume of a cone formula to calculate its height:

Cone volume = 1/3 * base area * height

1/3 * pi * 62 * 4 = 48bold pi

48pi = 48bold pi

As a result, Cone A's height is 4 units. The radius is also 6 units, as we can see.

Cone volume = 1/3 * base area * height

[tex]1/3 * pi * r2 * h = 48\\144 = r^2 * h\\144 = 8^2 * 3\\144 = 192[/tex]

Cone B does not have volume 48bold pi cubic units with these dimensions, but it does have the same volume as Cone A because they both have volume 48bold pi cubic units.

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Based on the given statement, the range of values of x is the values that do not exceed 82

From the question, we have the following parameters that can be used in our computation:

Using the above as a guide, we have the following:

The output of the operation cannot exceed 82

The range is teh set of the output values

This means that the range is all set of real values less than or equal to 82

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Answer:

Step-by-step explanation

Hello !

Answer:

[tex] \large \boxed{ \sf y = - 3 + \frac{9}{2} x}[/tex]

Step-by-step explanation:

We want to isolate y in the following equality :

[tex] \sf9x - 2y = 6[/tex]

First, let's substract 9x from both sides of the equality :

[tex] \sf9x - 2y - 9x= 6 - 9x[/tex]

[tex] \sf - 2y = 6 - 9x[/tex]

Now let's divide both sides by -2 :

[tex] \sf \frac{ - 2y}{ - 2} = \frac{6 - 9x}{ - 2} [/tex]

[tex] \boxed{ \sf y = - 3 + \frac{9}{2} x}[/tex]

Have a nice day ;)

Answer:

y=-3x+3

Step-by-step explanation:

y=mx+c

Substitute y = -3

x = -2

-3 = -3*-2+c

-3 = -6+c

-6+c = -3

c = -3+6

=3

y= -3x+3

Answer:

2, 3

Step-by-step explanation:

When a point is reflected over the y-axis, the x-coordinate changes sign while the y-coordinate remains the same. Therefore, if you reflect the point (-2, 3) over the y-axis, it will become (2, 3).

(Sorry, I tried to provide a picture but I could not.)

2

you divide 8 with 4 and the answer is 2